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Logical
Partitioning
Resources and
partitioning go hand-in-hand. Resources are a system's processors,
memory, and I/O slots. A logical partition uses software and firmware
to logically partition the resources on a system. I/O slots can
be populated by different adapters, such as Ethernet, SCSI, or other
device controllers. A disk (both internal and external) is allocated
to a partition by assigning it the I/O slot that contains the disk's
adapter.
Logical partitioning
(LPAR) is only limited by the total number of hardware resources
in the system. For example, a partition could have any number of
installed processors assigned to it, limited only by the total number
of installed processors. Similarly, a partition could have any amount
of memory, limited only by the total amount of memory installed
(minus the memory required for partition management/overhead). I/O
adapters are physically installed in one of many I/O drawers in
the system. However, with logical partitioning, any I/O adapter
in any I/O drawer can be assigned to any partition; however, only
one partition with that resource can be active.
Virtual I/O
devices provide for sharing of physical resources, such as adapters
and devices, among partitions. Multiple logical partitions can share
physical I/O resources of a system, and each partition can simultaneously
use virtual and physical I/O devices. Also, virtual I/O devices
allow partitions to be created without adding physical I/O adapters
to the system.
The System Planning Tool (SPT) is available to assist you in the design of LPAR systems.
System plans generated by the SPT can be deployed on the system by the HMC. The SPT is available to assist the you in system planning, design, validation and to provide a system validation report that reflects the your system requirements while not exceeding system recommendations. The SPT is a PC based browser application designed to be run in a standalone environment. You can find the SPT at http://www.ibm.com/systems/support/tools/systemplanningtool.
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Dynamic
LPAR
Dynamic LPAR (DLPAR) allows the "dynamic" addition, movement
(relocation of resources between LPARs), or removal of resources without
having to reactivate the partition or "power down" the operating
system. Consequently, customers utilizing DLPAR do not experience
an interruption in service.
In a static LPAR configuration, individual processors,
256 MB memory blocks, and I/O adapter slot resources are placed
under the exclusive control of a given logical partition. One of
the main advantages of the LPAR implementation is that it gives
fine-grained allocation control over these individual resources,
allowing them to be combined in almost any quantity and combination
to create a logical partition.
DLPAR extends these capabilities by allowing this
fine-grained resource allocation to occur not only when activating
a logical partition, but also while the partitions are running.
Individual processors, memory blocks, and I/O adapter slots can
be released into a "free pool," acquired from that free
pool, or moved directly from one partition to another--again, in
almost any quantity or combination depending on the total hardware
resources available.
If you have partitions that need more or can use fewer resources,
you can dynamically move the resources between partitions within
the managed system. A "move" operation is simply a combined
operation removing a resource from one LPAR and adding it to another.
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